Diehl, M[ichael]. Biography of Rev. Ezra Keller, D.D., Founder and First President of Wittenberg College. Springfield, Ohio: 1859. First Edition.
Kinnison, William A. An American Seminary: A History of Hamma School of Theology. Synod of Ohio, Lutheran Church of America, Columbus, OH, 1980. Limited Edition. Signed by Author.
Watts, Isaac. The Improvement of the Mind: or a Supplement to the Art of Logic. In Two Parts. To which is added, A Discourse on the Education of Children and Youth. (Exeter, New Hampshire, 1793.)
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